000 00281nam a2200097Ia 4500
008 220816s9999||||xx |||||||||||||| ||und||
020 _a9783540586616 (pbk.
245 0 _aPerturbation theory for Linear opertors
_cKato, Tosio
260 _aBerlin:
_bSpringer,
_c1976
300 _axxi, 619p.
999 _c3293
_d3293